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Hemodynamic Analysis of VenaTech Convertible Vena Cava Filter Using Computational Fluid Dynamics.

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  • 1School of Energy and Power Engineering, Shandong University, Jinan, China.

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Summary

Computational fluid dynamics reveals that VenaTech convertible filters (VTCF) create "viscous block" effects, impacting blood flow and clot capture in the inferior vena cava (IVC). Filter configuration significantly alters flow resistance and IVC patency.

Keywords:
VenaTech convertible filtercomputational fluid dynamicsdeep vein thrombosishemodynamicsinferior vena cava filter

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Devices

Background:

  • Inferior vena cava (IVC) filters, like the VenaTech convertible filter (VTCF), are crucial for preventing pulmonary embolism.
  • The hemodynamic effects of VTCF deployment on IVC patency and filter efficacy remain incompletely understood.

Purpose of the Study:

  • To investigate the hemodynamics of VTCF in various configurations using computational fluid dynamics (CFD).
  • To analyze the impact of VTCF deployment on blood flow patterns, stagnation zones, wall shear stress, and flow resistance within the IVC.

Main Methods:

  • Simulated non-Newtonian blood flow around VTCF in normal, reverse, and converted states using CFD with the Carreau model.
  • Quantified blood flow acceleration, wall shear stress enhancement, and relative flow resistance.

Main Results:

  • Prothrombotic stagnation zones were identified downstream of VTCF, extending significantly along the IVC.
  • The "viscous block" effect from thin VTCF arms accelerated flow and increased wall shear stress, aiding clot capture but potentially increasing thrombosis.
  • Flow resistance varied with VTCF configuration, increasing significantly in normal deployment and decreasing as the filter opened.

Conclusions:

  • Thin VTCF arms induce significant hemodynamic changes, influencing clot capture, thrombosis risk, and IVC flow impedance.
  • CFD is a valuable in silico tool for analyzing IVC filter hemodynamics, complementing experimental and clinical studies.
  • Filter configuration critically impacts IVC patency and hemodynamic performance.